1121988 is an undulating number in base 11.
It is a congruent number.
21121988 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 1121988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1621536).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1121988 is a wasteful number, since it uses less digits than its factorization.
1121988 is an odious number, because the sum of its binary digits is odd.
The square root of 1121988 is about 1059.2393497222. The cubic root of 1121988 is about 103.9112902317.
The spelling of 1121988 in words is "one million, one hundred twenty-one thousand, nine hundred eighty-eight".